Settling of Fine Sediment in a Channel with Emergent Vegetation
Publication: Journal of Hydraulic Engineering
Volume 126, Issue 8
Abstract
The potential for enhanced removal of sediment from flowing water in a channel by means of settling on vegetation was studied theoretically and experimentally. Settling on vegetation was modeled as a distributed sink of sediment with vegetation spread throughout depth and length of the channel. Sediment-capture experiments were performed in a laboratory channel using model vegetation and well-sorted silt. The theory predicts that settling on vegetation has the potential to increase sediment-capture efficiency considerably, and this was demonstrated in the experiments. The enhancement of sediment removal was greater for artificial vines than for inclined strips. For the runs with flow velocities >10 mm/s the sedimentation efficiency was less than predicted. The reduced efficiency could be related to bed destabilization (which was observed in some runs), re-entrainment from the vegetation, or sediment sliding off the vegetation.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 126 • Issue 8 • August 2000
Pages: 570 - 577
History
Received: Jul 28, 1998
Published online: Aug 1, 2000
Published in print: Aug 2000
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